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https://issues.apache.org/jira/browse/IMPALA-10849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved IMPALA-10849.
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Fix Version/s: Impala 4.1.0
Resolution: Fixed
> A LIKE predicate that ends in an escaped wildcard is incorrectly evaluated
> --------------------------------------------------------------------------
>
> Key: IMPALA-10849
> URL: https://issues.apache.org/jira/browse/IMPALA-10849
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Andrew Sherman
> Assignee: Andrew Sherman
> Priority: Critical
> Fix For: Impala 4.1.0
>
>
> If the last character of a LIKE predicate is an escaped wildcard (e.g. LIKE
> foo\%) then it is incorrectly evaluated. This is because the fast path
> optimizations in LikePrepareInternal treat the predicate as being a search
> for a string with a fixed prefix. If the fast path optimizations are
> commented out then the LIKE is evaluated correctly.
> A possible fix would be to make the fast path optimizations recognize that
> escaped wildcards cannot be evaluated by the fixed prefix search.
> This is a simpler bug than that discussed in IMPALA-2422 which is to do with
> ambiguities in the logic of unescaping string literals (which is more tricky
> to fix).
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